My experience is that it is very easy to rough out parts.
It never fails to surprise me how much effort it takes to get the parts
completely finished. There are so many engineering changes - some are
small and some are not so small. Here is a short list:

Little did I know how much effort would be required
to get all the panels to have a professional look and fit.
I've probably spent close to 4500 hours at this point. Remember
the devil is in the details.